The Wiseman Threading Tools Second Lead Machine Nut Metric HSS Tap in M16x2 is a precise, durable solution built for clean, dependable metric threading in metalworking projects. Designed for general purpose tapping, this high-speed steel (HSS) tap is ground to tight dimensional tolerances and finished uncoated for broad material compatibility.

Why this second-lead HSS tap stands out

• Second lead (USA plug) design: a two-start threading action that speeds up tapping and improves chip evacuation, making it ideal for higher production workflows or busy shops.
• HSS ground thread: engineered for sharp cutting edges and consistent thread formation, delivering accurate M16x2 threads with reliable longevity.
• Uncoated finish: versatile across materials and compatible with your preferred cutting fluids or lubricants to optimize heat management and tool life.
• BS 949 metric dimensions: manufactured to standard metric tolerances, ensuring reliable fit with metric nuts, inserts, and components.
• Right-hand thread: the common threading direction for most assemblies, enabling straightforward use with standard fasteners and hardware.
• Specifically sized for mid-range work: M16 diameter with a 2.0 mm pitch, suitable for a broad range of through-holes and threaded features in steel, aluminum, and similar alloys.
• General-purpose versatility: an all-around tapping tool that performs well in repair work, prototypes, and ongoing production where consistent thread quality matters.

Use cases and practical tips

• Ideal for machine shops, fabrication labs, and capable home workshops that demand repeatable, accurate metric threads.
• Pair with a sturdy tap wrench or quick-change holder to maintain stable alignment and reduce the risk of breakage.
• Lubricate with appropriate cutting oil to manage heat, extend tap life, and improve chip flow—especially in tougher materials.
• Begin with a properly sized pilot hole and maintain steady, even pressure to achieve clean threads without chatter.

Who benefits most

Professional machinists, toolmakers, and experienced hobbyists who require precise M16x2 threads, faster cycle times thanks to the second-lead design, and a dependable, uncoated HSS tapping solution that works across a variety of metals.

Care and maintenance

• Withdraw the tap gradually to break chips and avoid binding.
• Keep the tool clean and dry when not in use to preserve edge life.
• Store in a dedicated tool case to prevent misalignment and dulling from incidental contact.

The Wiseman M16x2 second-lead machine nut metric HSS tap combines robust construction with practical design choices that translate into tangible productivity gains and consistently clean thread quality in metric components.